The stand-ins and doubles don't tend to do the work that the Oscar is awarding though!
There WAS a big fuss made over the nomination of Linda Blair as Best Supporting Actress for The Exorcist, as Mercedes McCambridge felt that HER performance as the voice of Pazuzu possessing Regan, was what people remembered and enjoyed...well I say a "big fuss"....it was McCambridge who made that fuss